Explain the valence bond theory.

1.	Explain the valence bond theory.
Answer» Valence bond theory : 1. A covalent bond between two atoms is formed when the two atoms approach each other closely and one atom overlaps its valence orbital containing unpaired electron with the valence orbital of other atom that contains the unpaired electron of opposite spin. 2. The greater the overlapping of the orbitals, the stronger will be bond. 3. Valence bond theory gives a directional character to the bond when other than ‘s’ orbitals are involved. 4. Electron pair in the overlapping orbitals is shared bv both the atoms involved in the overlapping. 5. If orbitals overlap along internucleus axis, they form a strong bond called sigma (σ) bond. 6. If the orbitals overlap laterally, they form a weak bond called pi (π) bond.

Answer»

Valence bond theory :

1. A covalent bond between two atoms is formed when the two atoms approach each other closely and one atom overlaps its valence orbital containing unpaired electron with the valence orbital of other atom that contains the unpaired electron of opposite spin.

2. The greater the overlapping of the orbitals, the stronger will be bond.

3. Valence bond theory gives a directional character to the bond when other than ‘s’ orbitals are involved.

4. Electron pair in the overlapping orbitals is shared bv both the atoms involved in the overlapping.

5. If orbitals overlap along internucleus axis, they form a strong bond called sigma (σ) bond.

6. If the orbitals overlap laterally, they form a weak bond called pi (π) bond.

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